Spyda BIBS

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The Spyda BIBS (Built in Breathing System) is designed to supply pure oxygen during therapeutic treatment in a hyperbaric chamber. It can also be utilised to provide an emergency breathing gas source should the chamber environment become chemically contaminated or experience a fire.

It is an 'overboard dump' style BIBS, it has both supply and exhaust hoses. Exhaled gas is piped to the outside of the chamber thus preventing the potentially hazardous build up of oxygen which occurs when single hose units are installed. An increase in oxygen level above 21% equivalent at atmospheric pressure (0.21 bar ppO2) within a hyperbaric chamber can be a fire risk, and can also be detrimental to the health of the patient/diver if long exposure is experienced.

The main use of BIBS masks is for therapeutic decompression commencing at 18m. The Delta unit has been optimised to offer minimum breathing resistance at the relatively low rates of breathing and shallow depths associated with this procedure.

Robustness & Practical Design

The Spyda BIBS has been designed following feedback. Users are now demanding equipment that can withstand the bumps, bangs and physical abuse from day to day operations, yet still deliver first rate performance. The advanced polymer used for the main body is extremely robust and will undoubtedly provide longevity in service.

The oral nasal is easy to remove and replace. This permits divers to have their own oral nasal if desired, or otherwise permit easy biological decontamination.


The Spyda BIBS has been extensively tested and fully complies with ABS (American Bureau of shipping) standards under their latest rules for building and classing. The mask was tested to 300MSW/1000FSW in the presence of an ABS Surveyor and significantly exceeded the requirement as published in the 2010 version "Underwater vehicles, systems and hyperbaric facilities".

Spyda BIBS masks offer excellent Work of Breathing at 15 and 22.5RMV, which is the typical ventilation of a diver or hyperbaric patient at rest.

Performance & Quality

Bench testing of each BIBS mask prior to dispatch ensures performance is in accordance with the criteria established from the original test masks. Quality is paramount, and regular comparative testing is carried out to ensure the units have consistency in performance.

Use with 100% Oxygen

All component parts are cleaned, and the equipment is assembled, in our own clean workshop. The National Hyperbaric Centre's Oxygen Cleaning Procedures are used to ensure the masks are free from contamination.

Care must be taken to ensure that the BIBS mask and system is maintained at 'oxygen clean' status, as hydrocarbon contamination from external sources, non-compatible lubricants etc., could lead to a fire within the chamber, or gas system, with fatal consequences. If in doubt contact Spyda Systems Ltd or your Safety and Diving technical authority.

Operating Requirements

The inlet pressure should be set at 8.5 bar (125psi) above ambient pressure. The outlet hose should receive no more than 2 Bar (30psi) suction. Therefore beyond 20m/66ft external chamber pressure the Spyda BIBS should be protected by a Back Pressure regulator.


The BIBS mask should be included within a Planned Maintenance System (PMS).

IMCA reference BIBS systems within section 5.2 of the D018 DESIGN/DASS document, and this is a useful starting point and guidance for good practice within the industry.

The mask is easy to maintain and instructions including Chemical and Biological maintenance procedures required are contained within the manual.

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